CN115118825A - Session boundary controller system - Google Patents

Session boundary controller system Download PDF

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Publication number
CN115118825A
CN115118825A CN202210628537.7A CN202210628537A CN115118825A CN 115118825 A CN115118825 A CN 115118825A CN 202210628537 A CN202210628537 A CN 202210628537A CN 115118825 A CN115118825 A CN 115118825A
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China
Prior art keywords
terminal
signaling
sbc
processing module
media processing
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CN202210628537.7A
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Chinese (zh)
Inventor
王斌
潘建标
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Xiamen Yealink Network Technology Co Ltd
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Xiamen Yealink Network Technology Co Ltd
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Priority to CN202210628537.7A priority Critical patent/CN115118825A/en
Publication of CN115118825A publication Critical patent/CN115118825A/en
Priority to EP23176810.2A priority patent/EP4287583A1/en
Priority to US18/205,492 priority patent/US20230396714A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1053—IP private branch exchange [PBX] functionality entities or arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/102—Gateways
    • H04L65/1033—Signalling gateways
    • H04L65/1036—Signalling gateways at the edge
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1073—Registration or de-registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/80—Responding to QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
    • H04M7/0066—Details of access arrangements to the networks

Abstract

The invention discloses a session border controller system, comprising: the SBC signaling media processing module and the SBC signaling access module; the SBC signaling access module is used for receiving and forwarding a signaling sent by a terminal to the SBC signaling media processing module, re-registering and connecting the terminal when the terminal in a call is disconnected, and receiving and forwarding an information request of the terminal in the call to the SBC signaling media processing module after the terminal is reconnected; and the SBC signaling media processing module is used for processing the signaling and the media stream of the terminal, and when the terminal in the call is disconnected from the network, learning a transmission link for communicating with the terminal after the disconnection and reconnection of the network according to the information request, so that the signaling and the media stream are transmitted by the transmission link after the disconnection and reconnection of the terminal. The invention avoids the situation that the signaling and the media cannot be recovered due to the disconnection and reconnection of the network, and improves the experience of the user in the conversation.

Description

Session boundary controller system
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a session border controller system.
Background
An IP-PBX is a telephone system based on an IP network, and generally uses an SIP protocol, and it is a common practice to introduce an SBC (Session Border Controller) into the IP-PBX system, which can provide capabilities of compatibility, security, and media penetration. As a terminal of an IP-PBX, a network disconnection and a line drop are relatively frequent and normal (especially, a mobile terminal APP switches a network), and if the network is disconnected during a call, the influence on the user experience is great. Therefore, it is very important that the terminal recovers the network after the network is disconnected, and the signaling and the media can be recovered in the call as before.
In the existing disconnected network reconnection technology, the disconnected network reconnection of the IP-PBX terminal is limited by the SIP standard limitation, and is often not well realized or the realization effect is poor: some of them are simply kept in the call, i.e. the media is still connected, but the signaling is not connected, and at this time, the operation of PBX service in some calls is affected; secondly, initiating the INVITE with the replays after the terminal reconnects and registers successfully is equivalent to restarting a new call, if some states of the call before reconnection are considered, such as a recording state and the like, it cannot be guaranteed that the recording state before reconnection can still be maintained after reconnection, and some unexpected results may occur when the IP-PBX terminals on the other two sides trigger the replays INVITE at the same time.
Therefore, a session border controller system capable of ensuring signaling and media recovery after the terminal is disconnected and reconnected is needed.
Disclosure of Invention
The invention provides a session border controller system, which aims to solve the technical problem that signaling and media cannot be recovered after a terminal is disconnected and reconnected in the prior art.
In order to solve the foregoing technical problem, an embodiment of the present invention provides a session border controller system, including: the SBC signaling media processing module and the SBC signaling access module are connected with the SBC signaling media processing module;
the SBC signaling access module is used for receiving and forwarding a signaling sent by a terminal to the SBC signaling media processing module, re-registering and connecting the terminal when the terminal in a call is disconnected, and receiving and forwarding an information request of the terminal in the call to the SBC signaling media processing module after the terminal is reconnected; wherein the signaling comprises an information request;
the SBC signaling media processing module is used for processing the signaling and the media stream of the terminal, and when the terminal in the call is disconnected, the SBC signaling media processing module learns a transmission link for communicating with the terminal after the disconnection and reconnection of the network according to the information request, so that the signaling and the media stream are transmitted by the transmission link after the disconnection and reconnection of the terminal.
Compared with the prior art, the embodiment of the invention can separate the session border controller system into the SBC signaling access module and the SBC signaling media processing module, can enable the terminal to re-register and connect the SBC signaling access module when the network is disconnected and reconnected, and enables the SBC signaling media processing module to learn the transmission link capable of being sent to the terminal through the information request sent by the terminal, thereby ensuring that the signaling and the media stream can be recovered to the SBC signaling media processing module for conversation before the network is disconnected after the network is disconnected, avoiding the phenomenon that the signaling and the media cannot be recovered due to a new call caused by the network disconnection and reconnection in the prior art, and improving the experience of a user in the conversation.
As a preferred scheme, when a plurality of SBC signaling access modules exist, and the terminal in a call is disconnected, the terminal is re-registered and connected, specifically:
when a terminal in a call is disconnected, each SBC signaling access module receives a registration request sent by the terminal in sequence to re-register and connect the terminal until the terminal is successfully registered and connected to one SBC signaling access module.
It can be understood that, a plurality of SBC signaling access modules can still ensure that the signaling of the terminal can be connected and transmitted in the session boundary controller after the disconnection and reconnection of the network, so that the fault tolerance rate of connection failure is improved, and meanwhile, the switching of the SBC signaling access modules after the disconnection and reconnection of the network of the terminal can ensure that the terminal can also be switched to other IP-PBX system servers, so that the high expansibility is achieved.
Preferably, the information request of the terminal during the call includes: end source IP and port.
It can be understood that the SBC signaling media processing module in the information request sent by the terminal can generate a transmission link from the terminal to the SBC signaling media processing module through the SBC signaling access module, so that the SBC signaling media processing module can internally transmit a signaling back to the terminal according to the transmission link.
As a preferred scheme, the receiving and forwarding the information request of the terminal in the call to the SBC signaling media processing module specifically includes:
and receiving an information request of the terminal in a call, and forwarding the information request to the SBC signaling media processing module after adding the ID of the SBC signaling access module to a custom header of the information request.
It can be understood that, the ID of the SBC signaling access module itself is added to the custom header field of the information request sent by the terminal during the call, so that when the SBC signaling media processing module sends the request to the terminal, the SBC signaling media processing module can send the request to the SBC signaling access module correspondingly connected to the terminal according to the ID of the SBC signaling access module, so that the request and other information can be sent to the terminal.
As a preferred scheme, the learning, according to the information request, a transmission link for communicating with the terminal after the disconnection and reconnection, specifically includes:
and generating a transmission link for connecting the terminal with the SBC signaling access module after the disconnection and reconnection of the network according to the terminal source IP and the port in the received information request, and generating a transmission link for connecting the SBC signaling access module with the SBC signaling media processing module according to the self ID of the SBC signaling access module in the received information request, so as to obtain a signaling address of the terminal, and further generating a transmission link for signaling intercommunication among the terminal, the SBC signaling access module and the SBC signaling media processing module after the disconnection and reconnection of the network.
It can be understood that, the SBC signaling media processing module may obtain a signaling address of a signaling sent by the terminal according to the terminal source IP and the port in the information request, and the ID of the SBC signaling access module, and further generate a transmission link from the terminal to the SBC signaling media processing module through the SBC signaling access module, so that signaling intercommunication between the session border controller system and the terminal can be achieved.
As a preferred scheme, after the generating a transmission link for signaling intercommunication among the terminal, the SBC signaling access module, and the SBC signaling media processing module after network disconnection and reconnection, the method further includes:
and obtaining the media stream address of the terminal according to the symmetric RTP mechanism of the SBC signaling media processing module and the transmission link for signaling intercommunication, so as to learn and generate the transmission link for media stream intercommunication among the terminal, the SBC signaling access module and the SBC signaling media processing module.
It can be understood that the symmetric RTP mechanism can ensure that the media stream address of the terminal is obtained when the terminal sends the media stream to the SBC signaling media processing module after reconnection, so as to learn and generate a transmission link from the terminal to the SBC signaling media processing module through the SBC signaling access module, so that the intercommunication of the media stream can be realized between the session border controller system and the terminal.
Preferably, the signaling further includes a renegotiation request.
It is understood that the signaling is a control signal used between modules, the requests sent by the terminal and the like are all signaling, and different signaling, for example, the update request and the re-invite request included in the renegotiation request and the like, may trigger the session border controller system to perform different operations, so as to ensure that the terminal and the session border controller communicate smoothly and accurately.
As a preferred scheme, when the update request or the re-invitation request of the terminal is received and forwarded to the SBC signaling media processing module, the SBC signaling media processing module learns and generates a transmission link for interworking signaling and media stream; wherein the SDP text information of the update request or the re-invite request includes a media stream address of the terminal.
It can be understood that, when the signaling sent by the terminal to the SBC signaling media processing module is an update request or a re-invite request, the SBC signaling media processing module can directly carry the media stream address of the terminal in the SDP text information of the update request or the re-invite request without depending on a symmetric RTP mechanism, so that the SBC signaling media processing module directly generates a transmission link for communicating the signaling and the media stream, the efficiency of learning to generate the transmission link by the SBC signaling media processing module is improved, and the communication stability and accuracy of the terminal and the session boundary controller system are also ensured.
As a preferred scheme, the SBC signaling access module is stateless access.
It can be understood that the SBC signaling access module with stateless access can ensure that it only forwards the received signaling or other messages, and does not store any information in terms of communication and signaling media processing, so that when the terminal re-registers after the network is disconnected and efficiently accesses to any SBC signaling access module, it can still accurately and efficiently proxy the signaling and media in the call of the terminal to the SBC signaling media processing module that calls before the network is disconnected.
Drawings
FIG. 1: the structure diagram of a session border controller system provided by the embodiment of the invention;
FIG. 2: the structure diagram of the connection between the session border controller system and the external terminal provided by the embodiment of the invention;
FIG. 3: the invention relates to a sequence diagram of a process of network disconnection and reconnection of a terminal.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
IP-pbx (internet Protocol Private Branch exchange), is an IP-based telephone system that can completely integrate voice communications into a dedicated data network, thereby establishing a unified voice and data network that can be connected across locations.
Sip (session initiation protocol), session initiation protocol, IP telephony protocol proposed by IETF, is a text-based application-layer control protocol for creating, modifying and releasing sessions for one or more participants. The SIP is an IP voice session control protocol originated from the Internet, and has the characteristics of flexibility, easiness in implementation, convenience in expansion and the like.
SBC (session Border controller), session Border controller, SBC is a device or software deployed at the network Border for controlling SIP sessions, in the present invention, SBC is an access layer of a terminal in an IP-PBX system, providing capabilities of compatibility, media penetration, security, etc.
Example one
Referring to fig. 1, a session border controller system according to an embodiment of the present invention includes: SBC signaling media processing module 02, at least one SBC signaling access module 01.
The SBC signaling access module 01 is configured to receive and forward a signaling sent by the terminal 03 to the SBC signaling media processing module, re-register and connect the terminal 03 when the terminal 03 during a call is disconnected, and receive and forward an information request of the terminal 03 during the call to the SBC signaling media processing module 02 after the terminal 03 is reconnected; wherein the signaling comprises an information request.
The SBC signaling media processing module 02 is configured to process the signaling and the media stream of the terminal 03, and learn, according to the information request, a transmission link for communicating with the terminal 03 after the network disconnection and reconnection when the network disconnection occurs in the terminal 03 during a call, so that the signaling and the media stream are transmitted by the transmission link after the network disconnection and reconnection of the terminal 03.
As a preferred solution of this embodiment, the SBC signaling access module 01 is stateless access.
It can be understood that the SBC signaling access module 01 with stateless access can ensure that it only forwards the received signaling or other messages, and does not store any information in terms of communication and signaling media processing, so that when the terminal re-registers after a network is disconnected and efficiently accesses to any SBC signaling access module 01, the terminal can still accurately and efficiently proxy the signaling and media in the call to the SBC signaling media processing module 02 before the network disconnection and call.
It should be noted that the SBC signaling access module 01 directly accesses the SIP signaling of the terminal 03, the SBC signaling access module 01 implements stateless SIP proxy forwarding of the SIP packet between the terminal and the SBC signaling media processing module 02, the SBC signaling media processing module 02 accesses the media of the terminal 03, and the states of the SIP session, the media, and the like are maintained in the SBC signaling media processing module 02.
As a preferred solution of this embodiment, referring to fig. 2, when there are a plurality of SBC signaling access modules 01 and the terminal 03 during a call is disconnected, re-registering and connecting the terminal 03 specifically include:
when the terminal 03 in a call is disconnected, each SBC signaling access module 01 sequentially receives a registration request sent by the terminal 03 to re-register and connect the terminal 03 until the terminal 03 is successfully registered and connected to one of the SBC signaling access modules 01.
It can be understood that, a plurality of SBC signaling access modules 01 can still ensure that the signaling of the terminal 03 can be connected and transmitted in the session border controller after the disconnection and reconnection, so that the fault tolerance rate of the connection failure is improved, and meanwhile, the switch of the SBC signaling access modules 01 after the disconnection and reconnection of the terminal 03 can ensure that the terminal 03 can also be switched to the rest of the IP-PBX system server 04, so that the high expansibility is achieved.
In this embodiment, it should be noted that, in the session border controller system, as long as there is one SBC signaling access module 01, the functions of re-registering and connecting the terminal 03 and receiving and forwarding the signaling and media stream sent by the terminal 03 to the SBC signaling media module can be realized, and a plurality of SBC signaling access modules 01 can ensure that the terminal 03 can continuously attempt registration and re-connection after network disconnection, thereby improving the fault tolerance rate of reconnection failure of the terminal 03.
As a preferable solution of this embodiment, the information request of the terminal 03 during a call includes: end source IP and port.
As a preferred solution of this embodiment, the receiving and forwarding the information request of the terminal 03 during the call to the SBC signaling media processing module 02 specifically includes:
and receiving an information request of the terminal 03 in a call, and forwarding the information request to the SBC signaling media processing module 02 after adding the ID of the SBC signaling access module 01 to the custom header of the information request.
It can be understood that the SBC signaling media processing module 02 in the information request sent by the terminal 03 can generate a transmission link from the terminal 03 to the SBC signaling media processing module 02 through the SBC signaling access module 01, so that the SBC signaling media processing module 02 can internally transmit a signaling back to the terminal 03 according to the transmission link.
Further, the ID of the SBC signaling access module 01 itself is added to the custom header field of the information request in the call sent by the terminal 03, so that when the SBC signaling media processing module 02 sends the request to the terminal 03, the SBC signaling media processing module can send the request to the SBC signaling access module 01 correspondingly connected to the terminal 03 according to the ID of the SBC signaling access module 01, and the request and other information can be sent to the terminal 03.
As a preferred scheme, the learning, according to the information request, a transmission link for communicating with the terminal 03 after the disconnection and reconnection, specifically, includes:
and generating a transmission link for connecting the terminal 03 with the SBC signaling access module 01 after the disconnection and reconnection of the network according to the terminal source IP and the port in the received information request, and generating a transmission link for connecting the SBC signaling access module with the SBC signaling media processing module 02 according to the self ID of the SBC signaling access module 01 in the received information request, so as to obtain a signaling address of the terminal 03, and further generating a transmission link for signaling intercommunication among the terminal 03, the SBC signaling access module 01 and the SBC signaling media processing module 02 after the disconnection and reconnection of the network.
It can be understood that, the SBC signaling media processing module 02 may obtain a signaling address of a signaling sent by the terminal 03 according to the terminal source IP and the port in the information request, and the ID of the SBC signaling access module 01, and further generate a transmission link from the terminal 03 to the SBC signaling media processing module 02 through the SBC signaling access module 01, so that signaling interworking between the session border controller system and the terminal 03 can be achieved.
As a preferred scheme, after the generating a transmission link for signaling intercommunication among the terminal 03, the SBC signaling access module 01, and the SBC signaling media processing module 02 after network disconnection and reconnection, the method further includes:
and obtaining the media stream address of the terminal 03 according to the symmetric RTP mechanism of the SBC signaling media processing module 02 and the transmission link for signaling intercommunication, so as to learn and generate the transmission link for media stream intercommunication among the terminal 03, the SBC signaling access module 01 and the SBC signaling media processing module 02.
It can be understood that the symmetric RTP mechanism can ensure that the media stream address of the terminal 03 is obtained when the terminal 03 sends the media stream to the SBC signaling media processing module 02 after reconnection, so as to learn and generate a transmission link from the terminal 03 to the SBC signaling media processing module 02 through the SBC signaling access module 01, so that the intercommunication of the media stream can be realized between the session border controller system and the terminal 03. Symmetric RTP is a general mechanism and is a standard behavior, for the terminal 03, the terminal 03 records a source IP + port after receiving an RTP media stream, and the next time the terminal 03 sends the RTP media stream, the RTP media stream is sent to the recorded source IP + port, and the original path is returned; the same is true for the SBC signaling media processing module 02.
Further, the symmetric RTP mechanism is to solve network penetration, for example, the terminal 03 is in an intranet, the IP-PBX system server where the SBC signaling media processing module 02 is located is in an extranet, the terminal 03 can directly transmit the server, and the server directly transmits the signal to the terminal 03 without transmitting the signal to the terminal 03, and only the original path of the symmetric RTP mechanism can be used to return to the terminal 03.
As a preferred solution of this embodiment, the signaling further includes a renegotiation request.
Specifically, the renegotiation request includes, but is not limited to, an update request and a re-invite request.
It is understood that the signaling is a control signal used between modules, the requests sent by the terminal 03 and the like are all signaling, and different signaling, such as UPDATE request UPDATE included in the renegotiation request and re-invite request, may trigger the session border controller system to perform different operations, so as to ensure smooth and accurate communication between the terminal 03 and the session border controller.
As a preferred solution of this embodiment, when the received and forwarded to the SBC signaling media processing module 02 is a renegotiation request of the terminal 03, the SBC signaling media processing module 02 learns and generates a transmission link for interworking signaling and a media stream at the same time; wherein the SDP text message of the renegotiation request includes the media stream address of the terminal 03.
It should be noted that, after the terminal 03 disconnects from the network and reconnects to the network, in addition to initiating a simple information request, a renegotiation request may also be sent, including an UPDATE request UPDATE or a re-invite request reINVITE, that is, the latest signaling address and media address of the terminal 03 are directly carried in the SDP text and transmitted to the SBC without relying on a symmetric RTP mechanism. The Session Description Protocol (SDP) provides multimedia session description for purposes of session announcement, session invitation, and other forms of multimedia session initialization, among others, and SDP textual information includes, but is not limited to, session name and intent, session duration, media comprising the session, and information about the received media (media stream address, etc.).
It can be understood that, when the signaling sent by the terminal 03 to the SBC signaling media processing module 02 is a renegotiation request, the SBC signaling media processing module 02 can directly carry the media stream address of the terminal 03 in the SDP text information of the renegotiation request without relying on a symmetric RTP mechanism, so that the SBC signaling media processing module 02 directly generates a transmission link for signaling and media stream intercommunication, the efficiency of learning to generate the transmission link by the SBC signaling media processing module 02 is improved, and meanwhile, the communication stability and accuracy of the terminal 03 and the session border controller system are also ensured.
Please refer to fig. 3, which is a timing chart of the disconnection and reconnection process of the terminal in this embodiment. Before the network is reconnected, the terminal normally communicates with the IP-PBX system server through the first SBC signaling access module 01 and the SBC signaling media processing module.
When the terminal is disconnected and reconnected, if the first SBC signaling access module cannot REGISTER and connect the terminal, the terminal may be switched and re-registered in the second SBC signaling access module, and specifically, the terminal REGISTERs by sending a REGISTER request to the second SBC signaling access module.
And after the network disconnection and reconnection of the terminal are completed, initiating an INFO request (information request) in the call to a second SBC signaling access module which is newly accessed. Because the signaling access module is a stateless proxy, the signaling access module can still proxy the signaling in the call of the terminal to the original signaling media processing module, wherein the original signaling media processing module is an SBC signaling media processing module for normal communication of the terminal before the disconnection and reconnection of the network, that is, the state of the terminal before the disconnection and reconnection of the network is all stored in the SBC signaling media processing module, and the call state can be continuously recovered after the disconnection and reconnection of the network, and the recovery of the signaling and the media stream is ensured.
After the INFO request is forwarded to the original SBC signaling media processing module, the signaling media processing module can learn in reverse direction and know how the request in the subsequent call needs to pass through the latest second SBC signaling access module, and finally send back to the terminal. Through an INFO request, the signaling at both sides, namely, the signaling is sent to the SBC signaling media processing module and the terminal, the connection can be made again, and due to the symmetrical RTP mechanism of the SBC signaling media processing module, the media stream is sent to the SBC signaling media processing module after the terminal is reconnected, the SBC signaling media processing module can learn the latest media stream address of the terminal, and the media streams can also be intercommunicated.
The key point of the embodiment of the invention is to realize a set of session boundary controller system for providing terminal access based on SIP standard, the session boundary controller system separates an SBC signaling access module and an SBC signaling media processing module, the terminal can only switch different SBC signaling access modules at most when the network is disconnected and reconnected, then the terminal enables the SBC signaling media processing module to learn and generate a latest transmission link sent to the terminal by sending an information request, and the intercommunication of signaling and media between the terminal and the session boundary controller system can be realized due to a symmetrical RTP mechanism of the SBC signaling media processing module, thereby realizing the recovery of the signaling and the media.
The embodiment of the invention has the following effects:
compared with the prior art, the embodiment of the invention can separate the session border controller system into the SBC signaling access module and the SBC signaling media processing module, can enable the terminal to re-register and connect the SBC signaling access module when the network is disconnected and reconnected, and enables the SBC signaling media processing module to learn the transmission link capable of being sent to the terminal through the information request sent by the terminal, thereby ensuring that the signaling and the media stream can be recovered to the SBC signaling media processing module before the call is disconnected after the network is disconnected, avoiding that the signaling and the media cannot be recovered due to a new call caused by the disconnection and reconnection of the network in the prior art, and improving the user experience in the call.
The above-mentioned embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, and it should be understood that the above-mentioned embodiments are only examples of the present invention and are not intended to limit the scope of the present invention. It should be understood that any modifications, equivalents, improvements and the like, which come within the spirit and principle of the invention, may occur to those skilled in the art and are intended to be included within the scope of the invention.

Claims (9)

1. A session border controller system, comprising: the SBC signaling media processing module and the SBC signaling access module are connected with the SBC signaling media processing module;
the SBC signaling access module is used for receiving and forwarding a signaling sent by a terminal to the SBC signaling media processing module, re-registering and connecting the terminal when the terminal in a call is disconnected, and receiving and forwarding an information request of the terminal in the call to the SBC signaling media processing module after the terminal is reconnected; wherein the signaling comprises an information request;
the SBC signaling media processing module is used for processing the signaling and the media stream of the terminal, and when the terminal in the call is disconnected, the SBC signaling media processing module learns a transmission link for communicating with the terminal after the disconnection and reconnection of the network according to the information request, so that the signaling and the media stream are transmitted by the transmission link after the disconnection and reconnection of the terminal.
2. The session border controller system of claim 1, wherein when there are multiple SBC signaling access modules and the terminal in a call is disconnected, the terminal is re-registered and connected, specifically:
when a terminal in a call is disconnected, each SBC signaling access module receives a registration request sent by the terminal in sequence to re-register and connect the terminal until the terminal is successfully registered and connected to one SBC signaling access module.
3. The session border controller system of claim 1, wherein the request for information by the terminal during a call comprises: end source IP and port.
4. The session border controller system of claim 3, wherein said receiving and forwarding the information request of the terminal in the call to the SBC signaling media processing module specifically comprises:
and receiving an information request of the terminal in a call, and forwarding the information request to the SBC signaling media processing module after adding the ID of the SBC signaling access module to a custom header of the information request.
5. The session border controller system of claim 4, wherein the learning of the transmission link for communicating with the terminal after the disconnection and reconnection according to the information request specifically comprises:
and generating a transmission link for connecting the terminal with the SBC signaling access module after the disconnection and reconnection of the network according to the terminal source IP and the port in the received information request, and generating a transmission link for connecting the SBC signaling access module with the SBC signaling media processing module according to the self ID of the SBC signaling access module in the received information request, so as to obtain a signaling address of the terminal, and further generating a transmission link for signaling intercommunication among the terminal, the SBC signaling access module and the SBC signaling media processing module after the disconnection and reconnection of the network.
6. The session border controller system of claim 5, wherein after said generating a transmission link for signaling interworking among said terminal, said SBC signaling access module, and said SBC signaling media processing module after network disconnection and reconnection, further comprising:
and obtaining the media stream address of the terminal according to the symmetric RTP mechanism of the SBC signaling media processing module and the transmission link of signaling intercommunication, thereby learning and generating the transmission link of media stream intercommunication among the terminal, the SBC signaling access module and the SBC signaling media processing module.
7. A session border controller system according to claim 1, wherein said signaling further comprises a renegotiation request.
8. The session border controller system of claim 7, wherein when it is the update request or the re-invite request of the terminal that is received and forwarded to the SBC signaling media processing module, the SBC signaling media processing module learns and generates a transmission link for interworking signaling and media streams at the same time; wherein the SDP text information of the update request or the re-invite request includes a media stream address of the terminal.
9. A session border controller system according to any of claims 1-8, wherein said SBC signalling access module is stateless access.
CN202210628537.7A 2022-06-02 2022-06-02 Session boundary controller system Pending CN115118825A (en)

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